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firmware: microchip: fix UL_IAP lock check in mpfs_auto_update_state()

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To verify that Auto Update is possible, the mpfs_auto_update_state()
function performs a "Query Security Service Request" to the system
controller.

Previously, the check was performed on the first element of the
response message, which was accessed using a 32-bit pointer. This
caused the bitwise operation to reference incorrect data, as the
response should be inspected at the byte level. Fixed this by casting
the response to a  u8 * pointer, ensuring the check correctly inspects
the appropriate byte of the response message.

Additionally, rename "UL_Auto Update" to "UL_IAP" to match the
PolarFire Family System Services User Guide.

Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
This commit is contained in:
Valentina Fernandez 2024-11-18 15:53:54 +00:00 committed by Conor Dooley
parent 40384c840e
commit 48808b55b0
1 changed files with 2 additions and 2 deletions
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4
drivers/firmware/microchip/mpfs-auto-update.c
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@ -402,10 +402,10 @@ static int mpfs_auto_update_available(struct mpfs_auto_update_priv *priv)
return -EIO;
/*
* Bit 5 of byte 1 is "UL_Auto Update" & if it is set, Auto Update is
* Bit 5 of byte 1 is "UL_IAP" & if it is set, Auto Update is
* not possible.
*/
if (response_msg[1] & AUTO_UPDATE_FEATURE_ENABLED)
if ((((u8 *)response_msg)[1] & AUTO_UPDATE_FEATURE_ENABLED))
return -EPERM;
return 0;